Effects of Cutting Speed on Surface Integrity and Fatigue Performance of Hard Machined Surfaces

Abstract

The study investigates the effects of cutting speed on the surface integrity and fatigue performance of hard machined surfaces. The results demonstrated that a higher cutting speed induces more compressive residual stresses and results in an increasingly softened layer. Crack initiation and crack propagation lives were extended by up to 192% and 168%, respectively, relative to increases in the cutting speed. Consequently, the fatigue life was extended by up to 174% with increases in the cutting speed. The fatigue tests demonstrated that the cutting speed significantly influences fatigue life and that the effect further increases with decreases in the level of loading.